I am sure that there are many existing methods to what I wish to achieve, however one I idea I had was to find a standard screw-cap fitting for a sink's tailpiece, so that I could then fill the entire pipe with bleach and cap it off at the top to take action on the fungus growing in all it's intricate places:
Would such a technique work and does such a fitting exist please ?
Would such a technique work and does such a fitting exist please ?