For the sink:

There are other tips for descaled to descale your bathroom. Including lemon. If you spray the taps and shower with the juice and let it stand before rinse. Your sink will be like new.

Another technique for the button is to unscrew and dive into white vinegar, an ideal home-made solution for many uses. Leave it all night and you’ll see that this device will shine. It is best to put it in a sealed bag that you will close with an elastic band.
For tiling:

The best way to make your tile shine with a thousand lights is… the liquid dishwashing detergent. This soapy product mixed with warm water is ideal for removing dirt from the ground. To get the most out of it, use a spray bottle and spray the contents on the tiles. Write down the distances.

Leave the cleanser to act for at least two hours and rub shoulders with a clean cloth. Any inlaid residue will disappear. To clean the very dirty slurry, pour water to which hydrogen peroxide has been added and leave to act for 30 minutes. The result is magic.
For the shower curtain: