If you find there is water water standing in your sink and it is no longer draining properly you have probably got to that troublesome stage where hair and other things have got stuck in the pipe below the plughole. You are going to need to sort it out, and the experts at Germany’s DIY Academy have lots of good advice to help you tackle the problem. First of all, they say, you should not resort to chemical drain cleaners, because they could actually make the problem worse. They cause a chemical reaction that generates a lot of heat which can cause deposits of soap, grease and hair to form an e…