Can i manually clean a DVD recorder laser with achol?

Personally I wouldn't use a solvent on the lens, instead I'd use a fine bristled brush. A clean makeup brush works good. That said if your lens has something stuck to it(as apposed to the normal fine dust) I guess iso alcohol would be one of the gentlest of solvents you could use.
Truthfully I've never had a take apart laser cleaning fix anything that a cleaning disc didn't help. Actually cleaning discs usually don't help either but I've had them help a few times, but the times they didn't help I've tried the manual cleaning method which didn't help either.

There are different cleaning procedures for different brands.

In the following thread I've given detailed cleaning information for DVD Drives found in Panasonic recorders:

http://www.avsforum.com/avs-vb/showt...8#post14479898

In the following post I've given detailed cleaning information for DVD Drives found in Funai manufactured recorders, Philips, Magnavox, Toshiba, Sylvania, Emerson, PYE, Symphonic, TruTech and others:

http://www.avsforum.com/avs-vb/showt...2#post19647592