It would be nice if there was a product available (or better still a raw chemical that could be bought cheaply in bulk ) that would make smears dissolve.
For instance what would be the effect of a handfull of caustic soda pellets chucked into a besmeared bog, (Probably needing a warning to flush before use) surely this would turn the fat in the smears into soap which would be soluble and which could be washed away with a bucket of hot water.
However, if it's stuck and doesn't easily wipe off with a brush, that's usually because it's mixed with hard water scale. A small dose of brick acid (fairly conc hydrochloric) works well, but I wouldn't use it if you have cement mortared or cast iron sewer pipes. Don't splash it anywhere, don't try using it on vitreous enamel such as a bath (porcelain is OK), and make sure any other chemicals (particularly bleach, other detergents) have been well flushed and washed out of the pipework first. A small mount of acid added to the bowl over night means just one wipe with the toilet brush in the morning leaves the bowl looking like new after flushing. In a really bad case (rented house where the bog probably hadn't been cleaned for years), a second dose was required, but that was it. Don't use anything hard to scratch away at the deposit, as you may mark/craze the enamel surface.
You can also use a descaler like Furnox DS-3, but you may get a slight blue stain from the indicator dye left behind for a week or so.
The full fat coca cola is brillo, fab for cleaning car engines as well. drop a 2p coin in a glass overnight, and see the difference. you won't want to drink it again
A squirt of basic toilet cleaner is usually enough to deal with such things, just leave it to soak as long as it can. Sulphuric acid is about the best loo pan cleaner and turd killer, but definitely not something to leave lying around for whoever to use.
Why do you say "assuming you clean them"? Do you mean that if you don't clean them, they won't suffer from P&C acids, and is this because the acids will attack the plaque etc in preference to the teeth themselves?
do you have domestos, or aldi's power force heavy duty cleaner, a squirt of that every now and again, leave a bit then flush, works wonders. ps it is a bit caustic
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