need help estimating for a customer who wants lawn dethatched. I figure i'd just charge hrly rate + rental cost (110.00). My question is i'm not sure how lmany hrs it would take. I have never dethatched before. The lawn is nearly an acre, mostly kentuck blugrass, (alot of crabgrass mixed in). Wide open lawn with just a few mulch beds in the mix. Waste will be disposed of on site. Also there are several dead spots where grubs have destroyed areas. Any info on a good grub control much appreciated. Thanks in advance.