I opt for paddling pool or floor (covered in a sheet) during my own sessions. I haven't had the pleasure of using a gunge tank yet, although I hope to in the future. Kacie James recently used a gunge tank to bean herself. the ultimate humiliation.
In terms of purchased scenes. I love seeing girls messed up on the floor, then required to go into a gunge tank for the finale. Totally Gunged is one of my favourite sites. The fact that the gunge tank is the centrepiece and you can't see anything else around it.
Personally, I don't like outdoor scenes and I'm not sure why. I also prefer when it's on the floor (covered in a sheet) when purchased as it gives a more premium feel, than a paddling pool.
If I'm using the gunge tank during the summer then that's outside weather permitting. If it's just me getting messy then usually it's the shower as the clean up is much easier. If it's me and another then a paddling pool is used.
Indoors in a reasonable sized lined paddling pool for me. It means you can use pretty much any messy items and roll it all up for disposal when you're done
Same goes for scenes to watch, with the exception of proper outdoor mud of course
Interesting question. The answer does differ between your two scenarios for me.
Getting messy myself is generally a prelude to sex, so we usually do so on the bed, covered in a plastic sheet plus an ordinary sheet (my wife prefers the feel of a sheet to just plastic). Occasionally we may top that with a paddling pool if there's going to be a lot of mess.
Looking at pictures / videos of messy girls, though - I find it most exciting if it looks as if they didn't set out to get messy, so better if they're in some sort of "everyday" setting.
Getting messy myself is generally a prelude to sex, so we usually do so on the bed, covered in a plastic sheet plus an ordinary sheet (my wife prefers the feel of a sheet to just plastic). Occasionally we may top that with a paddling pool if there's going to be a lot of mess.
Great minds! I was just going to bring up a messy bed.... using a sheet on top of the plastic is an excellent idea. The comfort of the mattress really heightens the sensual feelings of the mess, especially when there are two of you.
And just the idea of a paddling pool on top of the bed gets me into a lather.....