The patios have stuff piled out on them.  

Hi @James GreenYou should rent a dehumidifier for a few days and get the moisture out of the air.Also, seal off the basement doorway with plastic so there's no way for potential mold affect your tenants.And finally, this is going to happen again, you want to solve the issue.Best to you.

The other quoted me $100 to remove 9 screws and $3,000 to remove and reinstall an existing drain that cuts across the patio.

I have a 94 mobile home on 3 beautiful green carpet grass lots with semi closed garage and backYard patio area and treehouse.

If you're redoing the kitchen, find a picnic table and hook up a plastic deep sink if there's going to be any delay getting the new kitchen in.  

Is it the plastic sheet under the slab is ineffective, maybe. 

But a new buyer might want new flooring throughout, new counter tops, and maybe more upgrades like a back patio and landscaping.  

My "new" car is 10 years old, I reuse plastic bags, and combine all my errands into one trip to save gas.

I also got a plastic sign printed with the new name of the building and "welcome home".

They have to wrap it all in plastic and make sure none of the paint chips are left behind.