When you dry your shower after showering and remove any traces, we advise you to dry the shower shelf as well. This keeps the material nice and supple for longer. Plastic in particular can quickly become unsightly due to moisture. But water stains can also be seen on metal, which simply doesn't look nice.
You should also clean the shower caddy more often to remove limescale stains, which can occur in the shower. Or remove the old soap residues that can occur when you put shower gels and shampoos on the floor. But all in all, it is very easy to keep a shower caddy clean.