Product Review Frank scours the Earth - All purpose non-scratch scours are an affordable and effective scouring sponge, safe for use on delicate surfaces. Especially effective for cleaning glass shower doors (always test your surface first). They are even helpful when tackling stubborn build-up. Available for a reasonable price, they make cleaning your bathroom easier.  Pros: Can be used for cleaning various hard surfaces in the home Safe on glass and non-stick cookware A Can