I'll call Baja

Methylene chloride, can safely be used on Lexan. I did some research, and everything I found said it was OK. Don't use MEK! That's Methel Ethel Ketone. Not the same thing. If you're not sure, call TACC International. They'll tell you if it can be used on Lexan.

Good catch.
We used to use MEK on just about everything. Used it as a plexi solvent glue, used it to clean brushes, used it to clean everything. I expect we will end up with some nasty cancer one day.

MEK is nasty stuff! I used to use it to degrease parts prior to doing accelerated aging tests on deep drawn aluminum components (As per UL spec).

Shooter my windsheild cracked so i took it of an took it to a place called plastic menders. they sad they could fix good as new, well a long story short is dont waste your money. unless it is not visible.

I have done this repair. The boys are right. Methylene Cloride!!! A squeeze bottle applicator with a small hyperdermic needle is used to apply along the break. If done right it will look O.K. The real trick is to not use too much M.C. as it will etch the plexi. M.C. fuses the pieces together and is a strong repair. I happen to work next door to Commercial Plastics in Queens NY and they are or were afilliated with comstic. They are called Comco now and are owned by G.E. Plastics. They actually make plexiglas there in autoclave's. Every other night a tractor trailer tanker of plastic pellets unloads through a steel flex hose. What noise that makes ! Also the smell from the melted plexi gives me a migrain ! Maybe a little too much info though. Always HAVE FUN<BBB

Also have used MEK in a metal shop I worked in 12 years ago. Basically it gave you a rush. After not using it for a week I developed severe withdrawal symptoms, such as depression, and malaise (feeling out of it) which took me about a month to realize. This stuff is bad news. Also used Methylene Cloride to strip paint off of parts. On a hot summer day it would evaporate almost as fast as I poured it out of a 55 gallon drum. Even with a rubber hood and gloves and a supplied air respirator. I felt a rush of cold then hot when entering or leaving the area. I sometimes worry about the potential of future health problems. I guess when your 18 19 and 20 years you don't think of these things. BBB :(