Composite Sinks Cleaning Recommendations

Sink do's

Clean regularly with hot soapy water and a soft cloth, this is much easier and more preferable to the sink finish than infrequent 'heavy' cleaning.
Use soft or micro fibre cloths (eg. E-cloth).
A 50% mix of water and white vinegar can be used to remove limescale deposits, ensure to rinse thoroughly after use, do not leave the vinegar in contact with the surface. A nylon scratch pad or toothbrush can be used on difficult areas. Dry the sink after use to delay future build up.
Always rinse the sink with water after cleaning or preparing food.

Sink dont's

All the items below are known to have a damaging effect on coloured composites, to ensure your product(s) last beyond its warranty period you should avoid this non exhaustive list below:

Spray cleaners (irrespective of the label claims).
Photographic developing solutions.
Bleach - diluted or neat, especially do not soak items in the bowl for any period.
Abrasive cloths and creams.
Descaling solutions.
DIY related products and chemicals.
Oven cleaners.
Cheaper double sided sponge scrubbing pads, (the dye often escapes from the rougher side).
Food, hair and fabric dyes.
Ammonia.
Drain cleaning products containing sodium hydroxide, hydrochloric or sulphuric acid.
Steel wool pad, note if you use these to clean cookware all small broken 'hairs' should be flushed from the sink, otherwise they will rust.
Leaving any wet cloths or sponges on the surface for prolonged periods.
Nail varnish or remover solution.
Avoid impact or 'dragging' with soft aluminium cookware, the sink is harder than the pan and will leave aluminium streaks on the sink.
Avoid placing cookware directly onto the sink from the heat source, use a trivet instead.
Do not use a plastic bowl in the sink, dirt and grit will become engrained in the bottom of the plastic bowl and scratch the sink.

'Deep Cleaning'

It should be noted that if the above advice has been followed then 'deep cleaning' should not be necessary. 'Deep cleaning' should be seen as a last option after trying the above cleaning advice, repeatedly using these methods will alter the appearance of the sink and reduce its lifespan. You should start with the (first) least aggressive method.

1. Absorb as much contaminate as possible with kitchen roll, rinse with lots of hot water.

2. A proprietary kitchen cleaner and a stiff nylon brush with less than 5% bleach content.

3. 'Bar keepers friend' or 'Cif' cleaning cream and a stiff nylon brush or nylon scrubbing pad, this is good for removing stubborn stains and silver marks from metal cookware.

You should always rinse the sink thoroughly after following any of the above steps, it is worth noting that stronger chemicals should not damage the sink itself but would damage the waste kit so should be avoided.