I use this all the time . It works very well just make sure you cut off as much as you can 1st .

Does it work on really old sealant?

thanks op

Does what it says good stuff

thanks op

Used it in past works ok as previously mentioned you need to get most of the sealant off first to get maximum benefit. Word of caution, doesn't remove the sealant off brickwork very well if it's around a PVCU window but around baths e.c.t. works good. Heat

I've tried this and other types - never had any effect.

Much prefer a stanley blade and solvent cleaner.

I've used this before ,can require multiple applications... but does work

DIY Question : So the mouldy sealant around some of the shower tiles can be removed with this and then I just get one of those white silicone sealant tubes from Screwfix and go over the gap again ?

Forgive my ignorance, but how do you ensure that this does not affect the newly applied sealant? Is it just as simple as a quick wipe down with a damp sponge?

Thanks OP

Thanks, have some old sealant to remove from around the tub.

Great stuff, thanks for posting and heat added

Spray WD40 on old sealant leave for 5-10mins, comes off super easy

Make sure you wash off every trace from your bath tub otherwise it will eat through that as well.

Is this any good for no more nails?

No More Nails is a grab adhesive...wondered if this stuff would dissolve it...unlikely, just clutching at straws. Trying to remove the strip of metal that held glass shower screen to tiled wall.

According to the material safety sheet no more nails is Adhesive based on acrylate copolymer dispersion. https://www.buckandhickman.com/Assets/BuckHickman/DataSheets/DS_303601.pdf

Whether this stuff breaks down acrylate copolymer, I wouldn't know.

When removing glue, the first thing I usually reach for is acetone, providing it is not on a soluble surface like most plastics or paint. I don't use no more nails as a rule, and the only time I didn't stick very well, but I'd be tempted to try a very thin scraper to get in the glue join and if necessary apply a little heat to the metal(bearing in mind not to get it hot enough to crack the tiles), maybe with an old clothes iron.

Is there a difference ? Forgive my ignorance.

Totally,

Grout is a hard setting cement type material used to fill the gaps between tiles, sealant remains flexible when cured and is either silicone or acrylic based.

I use thick bleach to remove mould from grout, silicon sealant usually requires cutting out and replacing, unless the mould hasn't penetrated the surface at all in which case bleach sometimes works reasonably well.