It is an art. Some days I have it (partially) and some days not. Silicon eater releases the grip, doesn't 'eat' the silicon. It's all a pain in the backside tbh. If you do manage to get the old stuff clear then ensure that all grease is removed from the surface to be sealed. Mentholated Spirits is the 'cleaner' of choice, but as I write I am unsure if there are any effects on 'Plastic' baths. I think not, but don't quote me. Use Sanitary silicon only. Dow Corning safe bet. £5.00 tube max as retail, but they all try it on £££ wise.
New installations now can be undertaken without silicon if you know what you're doing. Send $$ in a plain brown envelope for full destructions!!
M
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