Sealants are a fairly good idea for someone who cannot wax very often. Personally I'd find regular waxing preferable but if that won't work for you then sealant is something to look into to. I don't know that much about them as I've never really had a need for it so maybe someone here knows more.
I use the mr. clean thing minus the soap, and have since stopped using the filter as I don't find it to be all that helpful. Also they are not especially durable and some soaps tend to clog it. Having something that can spray soap is nice and avoids the dirt bucket. Something like this: 9 Pattern Hose Nozzle And Car Wash Dispenser - Cleaning Tools - Car Washing - Car Care - Griot's Garage
is cheaper and probably a better idea.