If you're using those commercially available drain unclogger, it may damage your bathroom tiles if used incorrectly because they are highly acidic. I bought one from Ace hardware once and I terribly regretted it as it slightly damaged my bathroom tiles.

Instead, I'd recommend that you boil a kettle of water with some laundry detergent. Make sure it's boiling hot and then slowly pour it down to the bathroom floor trap. You may need to repeat 2 to 3 times and it is highly effective.

Hope this helps.

This post has been edited by pastacarbonara: Mar 30 2016, 11:49 AM