Instead, it is suggested that a simple solution of 50% white vinegar and 50% water is your best bet. Make up the solution into a spray bottle, spray the afflicted area, and with a sponge or brush give it a gentle scrub. Follow this up by rinsing away the vinegar with water and drying off the sink with a towel or cloth.
Cleaning granite composite sink with baking soda, white vinegar and sunflower oil, first clean well with baking soda and vinegar, then rinse and dry, then add sunflower oil and wipe it clean with tissue. The more you do it the better will become, better than any other chemicals cleaners that are toxic and never as good.
This type of sink is easy to clean
Keeping it clean is also important. You can use a magic eraser sponge to remove stains and a 50/50 water-bleach solution for cleaning.
This is from Bar Keeper's Friend: Bar Keepers Friend (BKF) can be used to remove stubborn stains from composite sinks, but it shouldn't be used for DAILY cleaning.
Sink dont's
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.
If your composite sink has limescale staining or hard water stains, these can show up clearly against a dark-coloured sink. For these, you do need to use a diluted vinegar to help remove them. The key is not to use straight vinegar on the sink, but to make a mixture that is 50% water and 50% vinegar.
Weight: Composite sinks are typically heavier than stainless steel sinks, which can make installation a bit more challenging. Ensure your benchtop can support the weight and consider consulting a professional installer if needed.
Chemical Hazards: Never use harsh chemicals like bleach or ammonia directly on your sink, as they can harm the composite material. Tough Stains: If faced with stubborn stains, avoid harsh chemicals; instead, learn how to clean a granite composite sink using the safe and effective methods mentioned in this care guide.
Since the material is not entirely heat proof, you'll want to avoid pouring boiling water in a granite composite sink.
Avoid abrasive and acidic cleaners. They can damage your sink's finish and leave it more susceptible to scratches and hard water stains. To give your black composite sink a little extra shine, put a few drops of mineral oil (or olive oil) on a soft cloth and wipe down your sink once a month.
Hard water and minerals in the water can leave white stains on your sink.
The Pink Stuff paste is our favorite go-to for this sink material but there are many ways you can tackle the job! For white composite sinks that are particularly dirty, we sometimes use either 50/50 vinegar and water or a little bit of a paste created with baking soda and water.
Heat Resistance
As with all types of sinks, granite composite kitchen sinks are heat resistant. However, they are not heat-proof when it comes to extreme temperatures such as a hot pan taken off the hob and placed directly into the sink. The acrylic resin in the mix of a granite composite sink could warp or melt.
How long will a composite granite sink last? Composite granite sinks are quite durable and can last decades with normal use and proper care.
It is best not to use undiluted vinegar, but you can make a solution with 50% water and 50% vinegar to use on your composite sink. Spray the solution onto your sink, focusing on the limescale stains. Scrub away with a nylon brush until it is removed. Finally, rinse the sink with some clean water.
Apply a paste made of baking soda and water to the stains. Allow to soak, then scrub, rinse and dry. If neither of these steps work, you may consider trying BLANCO Activ powder which removes the layer of limescale and dirt and restores the sink to its original colour.
Another abrasive you can try is very fine grain sandpaper (e.g.. 1,000 or 1,200 grit) – used wet – to gently rub away the stain. This is used very effectively on burn stains on marble so should also work well for sinks made of similar natural stone or their composites.
Stain-Resistance — Composite sinks are nonporous, which makes them highly stain-resistant. It's always a good idea to wipe down, rinse and dry a sink frequently.
Taking Care of Your Sink
Do not use a plastic washing-up bowl in the sink as grit and other particles may become embedded in the bowl and scratch or erode the sink surface.