Mariah’s main cowl vents cleaned with Lacquer Thinner. Worked like magic!
Embedded mold that defied cleaners, buffers and cleansers. I thought I would have to replace both cowls.
A few swipes in the middle with a cloth dampened with Lacquer Thinner shows how well it took off the black guck with a minimum of scrubbing.
Now, there is no need spending lots of cash to replace the 5 inch main cabin cowls. Thanks to Larry Austin of Layla a Cape Dory 30.