That insulation dries out so bad that you just have to look at it and it falls off. Amazing any of it stays on. Hope you are wearing a dust mask and using a HEPA vacuum to clean it up.
The cleaning does look great .. 
__________________
Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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