... no ideas about "plastic equipment" either
I used Forbid in conjunction with DMSO as well... on some of the aforementioned aloes. The aloe mite is quashed for now, but the cuticle has been altered somewhat. No burning... but the waxy surface appears stripped and the leaves are changing shape slightly. Strangely, the new growth is emerging discolored as well. I still have to rule out the Forbid or a synergistic effect as causes.
Matt