Methane gas absorbs red light, and methane clouds reflect blue light, giving Uranus and Neptune their distinctive blue colors. Why do Uranus and Neptune have methane clouds, but Jupiter and Saturn do not

Jupiter and Saturn have high temperatures and they have very large gravitational pull compared to Uranus and Neptune.

Explanation:

Jupiter and Saturn have high densities meaning any methane on them is dragged down to their hot surface which prevents methane from ever forming clouds.