On the shelves in the supermarkets you can find a huge number of agents that say your bathroom will be like new, it will shine and smells wonderful, but they are full of toxins and cost a lot of money.
Try making this DIY spray at home. It will save you lots of money!
All you need is a dish soap and vinegar. Mix equal amounts of hot vinegar and dish soap.
Spray the dirty bathtub and sink with it. Allow to stand for 30 minutes and clean with warm water.
The results will be immediately noticeable.