Screwdriver's : DIY homemade projects

 Hydrochloric acid is sold as household product in supermarket.

Caution : as it is an acid, this product is very agressive, you must wear adapted protections as gloves and glasses to avoid projections which could burn your skin. Do not breath vapours.
Never put water in acid. You must always put before the water and then add gently the acid (otherwise a chemical reaction will occur with heavy heat built-up and some projections of acid). Do not mix acid with other products.

Main utilizations of this product are :

• Disolve scale deposit 

For example you can put some in your toilets and let the product for few minutes. Then simply brushing the toilet will remove any trace of scale, nomally very hard to remove. 
Note : if you use it on metallic parts as tap, you must dissolve the product in water (9 vols of water for 1 of acid) otherwise it will attack the chrome deposit and irremediabely damage it.

• unclog used water pipes

Just put the acid in clogged sink. Acid will dissolve the clogging and clean the pipe

• remove rust from steel

Pure hydrochloric acid is very efficient to remove rust from steel. Just dip the part in acid and check from time to time, as rust will dissolve first but if you let too much the part the base metal will also be attacked. THis method is good for ferous material but do not try with other metals as aluminium which will be dissolved by acid in few seconds (it will also emits somes dangerous gas as hydrogen).