Their Bottle, Your Blame: The Client-Supplied Products Conversation Worth Having

A client waves you towards the cupboard under the sink and says the words every cleaner has heard: 'There's bleach and a spray in there, just use mine.' It sounds helpful. It saves you carrying kit. It may even feel like the client is being thoughtful. But the moment you unscrew someone else's bottle, you are mixing their product into your risk, your reputation and potentially your insurance cover.

This is not about being precious. Client-supplied products are common in domestic cleans and even more common in offices, rented flats and holiday lets where a manager wants everything bought from one supplier. The trick is knowing where helpful ends and hazardous begins.

Why 'just use mine' feels easier than it is

Using the client's products can look like a win for everyone. They believe they are getting the exact finish they like. You avoid hauling extra bottles up three flights of stairs. There is less chance of a row about which product was used on the oak worktop.

But you are still the person applying the chemical. If the worktop discolours, the floor lacquer lifts or a cleaner gets a lungful of something aggressive, the conversation will not start with the client's shopping habits. It will start with what you did, how you did it and what you knew at the time.

That is why the 'just use mine' trap is rarely about the product itself. It is about control, evidence and liability.

The COSHH bit most cleaners skip

COSHH duties do not disappear because the bottle came from the client's cupboard. If you employ staff, you need to think about hazardous substances they may be exposed to, including products supplied by a customer. Even as a sole trader, your risk assessment and method statement should reflect what you are actually using on site.

Before agreeing, you want to see the original container and label. Not a faded label. Not a decorative bottle with 'kitchen spray' written on it in marker pen. The original. You need to know what the product is, what it contains, how it should be diluted, what surfaces it is safe for and what protective equipment the manufacturer recommends.

A safety data sheet, often called an SDS, is the useful backup. Most reputable manufacturers publish them online. If the client cannot tell you the brand, or the product has been decanted into an unlabelled spray bottle, that is not a small admin gap. It is a stop sign.

Insurance does not automatically follow the bottle

Public liability insurance is there for accidents, not for loose agreements. If a client's own product damages their floor, your insurer may ask whose product was used, who diluted it, who instructed its use and whether you followed the label. If the answer is vague, the claim can become a slog.

Some policies may treat client-supplied chemicals differently from your own. Check your policy wording or ring your broker before you make it a habit. Do not assume that because you are insured for cleaning, you are insured for every chemical a client hands you.

There is also a practical point. If the client bought a bulk industrial product online and decanted it, you have no real idea of its strength or age. A product that has sat in a hot cupboard for two years may not behave like a fresh one.

What to check before you agree

Keep the checks simple enough to actually do on a doorstep. Confirm the product is in its original container with a readable label. Ask for the safety data sheet if it is not a familiar household brand. Check the dilution instructions and whether the surface is suitable. Look at the condition of the surface before you start and take dated photos. Patch test anything risky, especially stone, sealed wood, coloured grout or new flooring.

Get the client's instruction in writing. A text or email is fine: 'You asked me to use your own product on the utility room floor. I have checked the label and will dilute it as directed.' That one line is worth more than an hour of arguing later.

If the product is decanted, unlabelled, out of date or clearly not meant for the surface, do not use it. Offer your own equivalent instead.

Documenting product use without drowning in paperwork

You do not need a separate form for every bottle. Add a product line to your job sheet or digital checklist. Record the product name, where it was used, the dilution if relevant and any client instruction. If you took photos of the surface before and after, keep them with the job record.

For regular commercial clients, agree a simple product list at the start. It can sit alongside the cleaning schedule and key handover notes. If the client changes products, they tell you and you update the list. That keeps everyone honest without turning a two-hour office clean into a compliance project.

When the worktop turns white

If something goes wrong, stop cleaning that area. Do not scrub harder, try to neutralise it with another product or promise to 'sort it'. Take photos in good light, keep the bottle and do not admit liability on the doorstep.

Write down what happened while it is fresh: what product was used, how it was diluted, what surface it went on, how long it was left and what the client said beforehand. Contact your insurer if a claim looks likely. Then speak to the client calmly and factually.

If they supplied the product, say so without turning it into an accusation. 'I used the spray you asked me to use, diluted as on the label, on the surface we discussed. I have photos from before I started and I have kept the bottle. I will pass this to my insurer so it can be looked at properly.' That is a far better position than trying to remember which unlabelled bottle you picked up.

When to politely insist on your own kit

There are times to stand firm. Unknown or decanted products, anything that smells industrial, products with missing labels, and chemicals proposed for stone, sealed wood or specialist flooring all justify a polite no. So does any situation where your insurer or risk assessment says you should use your own controlled kit.

You can frame it as a service standard rather than a distrust of the client. 'I'm happy to use your products where I can see the original label and safety data sheet. If it has been decanted, I'll use my own equivalent so we both know exactly what is going on the surface.'

Most clients accept that. The ones who do not are usually telling you something useful about how the rest of the job will go.

A simple rule for 2026: if you cannot read the label, you do not use it. If you cannot document the instruction, you do not agree to it. Client-supplied products can be part of a good working relationship, but only when they are a clear instruction rather than a vague wave towards the cupboard.