hi tazz, just rinse it under the hot tap thats what i do,
i've had mine now for over 12months and it's still ok, mine is not attachable
so i could'nt say about changeing the pad,
A REALLY good way to remove alge from the glass is with a new sharp CLEAN stanley knife blade, it works amazingly especially with that crusty green alge, i just hold it in my fingers at a steep angle, it wont scratch the glass at all, just be VERY carful when using it near the seal of the tank. I think u can acctually buy proper alge scrapers what hold the blades