Hi,

Brake cleaner evaporates pretty darn readily, so, I doubt that it would still be laying about to cause any cracklings.

This follow up explanation might have clues even if its gone away for now!

If you pulled and yanked on hoses, like you said you did to get the box out, then maybe you got a leakage of coolant some place.
Those lines are just up and to the right of the flame trap box.
They are in hard place to just change out and maybe there is a rubbed spot on one of the hoses.
They can last a long long time and never seem to get changed. I’m guilty of that!
The oil dip tube can rub on a hose there.
I have tweaked mine away from that curved hose.

It’s Possible that it started dripping over to the exhaust manifold side by running underneath out of sight.
There is a metal line that goes around the back of the engine to the water pump return hose.
It’s made of steel and can rust if the coolant is not maintained properly!
You might be lucky and it sealed its self, for now, anyways!
Watch your coolant level with a dark marker line on the side of the bottle and sniff for an antifreeze smell or residual stains.

Guess we will have to hide and watch for the thread to bounce up again!

Phil