i would recommend vita anti-wilt. you mix it 1 to 7 parts water, almost guarentees 100% clone survival. just use a spray bottle to completely cover them and it seals them but still lets them breathe.also i switched from grodan to rapid rooter plugs. i now have rooted and ready to transplant clones in 7-9 days. heres a link to get them both. i use a humidity dome for the the entire time and mist twice a day for about the first 5 days. the great thing about the rapid rooter plugs is you soak them with as much water as they can hold and its never too much. they are made up of natural stuff so they have many beneficial organisms to help support fast rooting. oh i also use root tech rooting gel. a quote from vita "Sold as a concentrate, this product is diluted and sprayed onto the leaves of cuttings or newly transplanted starts. A thin membrane covers the leaves not allowing water to escape, yet letting it breathe. This keeps the plant from wilting and allowing the plant to establish its new roots. Dilution rate is 7-1. Comes in a 4 or 16 oz bottle."
the first link is rooting gel, the second is the anti wilt and the third is the plugs
Discount Hydroponics - Rootech Discount Hydroponics - Anti-Wilt Discount Hydroponics - Anti-Wilt