I'm thinking about trying getting soaked in some clothes since it's easier cleanup than getting messy. What should I wear? And warm or cold water?

Whatever you think will turn you on the most! Set water to temp which will help that - why suffer for it!!

Pale colour rather than dark, clothes rather than track suit etc would be my choice.
Definitely warm shower, then you can linger and play..........................

Nothing beats a cold shower in soccer jersey and shorts

A hoodie with the hood up can be fun or basketball gear if you have any.
As for temperature how about going form hot to cold a few times and see how it feels.

Definitely in a jersey! I'm detecting a theme on this post!