Re: Grren Cement Walkway
A mild bleach solution will do the trick with the surface slime. If you're looking for something a little more environmentally friendly, use hydrogen peroxide which will kill the slim but not harm grass or anything else.
The AC drain I would set up so that it can't splash onto the house or surrounding area, then leave it alone. If the weather is hot enough to need the AC, then what small amount of condensate is dispensed should evaporate pretty quickly.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!