You can make a decent drain cleaner from store cupboard basics and this makes a perfect monthly deep cleaner that is affordable. We used 1/2 cup Baking Soda – sometimes called bicarbonate of Soda, 1/4 cup Table Salt and 1 cup or warm vinegar. 
Really easy and really simple to apply. We made up the baking soda and salt together then spooned on the bath drain. Then we sort of used the end of the spoon to feed it down each hole. You warm up the vinegar slightly and once it makes contact with the baking soda mix, it starts to fizz. Leave it for fifteen minutes, with the plug in to encourage the fizz downwards. Then run the hot tap for a minute. Really easy. 
For us this is all part of our attempt to reduce household bills at the same time as having a more eco-friendly approach to the home. We think that is cost us around £2 for the ingredients. We had them in our cupboards so could avoid an extra shopping trip especially for it all.
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