We have slideout covers, but Celerator's method is a good way to go. You will find a ton opinions regarding whether or not to use slideout toppers, but I have found them to be great and they prevent the "leaves and crap" problem. Sweeping or blowing them off is the next best thing IMHO. For maintenance and care, use the slideout seal treatment that comes in an aerosol can. Sprays on like shaving cream and wipe down. Prevents UV damage/weathering and keeps the seals soft and pliable. I typically treat 2x per year (fall and spring), but minimum should be once each year. Costs around $10 per can and can will last a while.