Actually, 100% mineral spirits are perfect for airbrushing enamels, and will do a great job cleaning your airbrush and for performing enamel washes. I've not heard of Mona Lisa spirits, but if it has 100% mineral spirits, you should be OK.
I find the BEST thinner for MM enamels is MM airbrush thinner in the black can. It's hotter than straight mineral spirits, meaning it's more volatile and will dry a little faster and possibly go through your airbrush a little better than the mineral spirits you buy at the local hardware store.
Is this the stuff you're referring to?
Gip Winecoff