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I have a sink in black granite resin. It is ugly: how to renovate it? I used cooking oil it works a little while but no more.

You do not indicate what makes your sink "ugly". If it is dirty, you must first avoid rubbing with an abrasive sponge or with a detergent. Depending on the type of resin (there are many formulations) some recipes work, others do not. Let's mentiondiluted alcohol, the lemon, the clay stone, the dishwasher soap, the window products, the black soap, the diluted vinegar, the cleaning products for the kitchen... These products should be applied by gentle rubbing and rinsing as soon as possible after the cleaning phase.

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