We have a shower / bathtub combination where the tub is toooooo
slippery to use as a shower. We have a suction cup mat in the bottom
of the tub and even it won't stay stationary. Both the tub and mat
are kept very clean.

Looking for advice on how to make the tub less slippery. Is there any
liquid cleaning solution I could use on the tub to take away the
slippery condition?

Any advice appreciated.