Currently planning out a session for next week, got a new outfit & heels sorted in the sales, excited to see how it handles the mess as it were.

But looking at making my own gunge or slimy substance to get messy with.

Thinking of Shaving foam being the bulk but I have different liquid substances from gels, oils & so forth (bathroom friendly items) I will use in sessions for a slimy effect.

Also as I do my sessions mainly in a bath, I'm wary of what is fine for down the plug, but also fine for over my outfit & shoes, as don't want them smelling of something I don't like.

Basically looking at combining everything as it were into 1 bucket & mixing all together see if end up with a gunge like substance. My question is would this mix ok and anything else I may need to consider.

Aware there's a similar thread on shaving foam, but thought I'm trying to make my own gunge as it were.

If helps at all, outfit I'm wearing for the session is a faux leather office outfit & vinyl patent heels, not sure if they may take a reaction to the wet or mess it goes through.

Soaps (shaving foam/shower gels) will break down oils- takes a bit for this to happen so you can mix and use, but not pre-mix and leave it overnight.
(likewise messy play with soap at the end can be a fun way to kick off the cleanup)

Soap (and anything water soluble) can go down the plug just fine. Foam you'll struggle with since it'll float. Other things unless you can dilute it into a fully liquid phase, just scoop it up (swish some water into it) and flush it down the toilet. Better safe than sorry.

Check the smells as you open packets (sniff the packets too- smells can pass through the seal). If you don't like the smell leave it out as it'll smell worse when you're wearing it.
Bad smells appearing later are typically from food items (mainly dairy stuff)