I recently switched from using a sand-type cat litter to a gravel-type cat litter because the latter is cheaper, and I'm tired of the sand-type containers piling up around the house. I'm kind of confused about properly maintaining the gravel-type, though.The bag says to remove the solid waste every day, but what um, about the wet waste? Does it just sit there until I throw the whole mess out? I think the remaining wet waste is aggravating my allergies, and I don't know what to do. I did like the sand-type because it clumps, and I could scoop out all waste. Should I just quit with the gravel-type?