[morzh]

Do you mean that steel tube with bristles? I mean, acid brush (yeah, if I take acid, I will see that one in my disturbed brain sulci).
I think I have one. Yes, that one is fairly stiff.
Oh well, not today...today I am lazy. And, I am frustrated by my Jeep dealer trying to fix ny rear defogger...for the 5th time.
But the day will come...soon...tomorrow...maybe...definitely...if I could find that brush...

I even know what every Russian would use for the liquid to dip it in. Mother-in-law's spittle. Very acidic. At least, in Russia it is.

There even was a joke: (you know how they used snake venom in topisal remedies to treat back ache).

A guy comes to his mother in law and asks her to spit on his lower back.
She gladly obliges and then asks, what for?
He answers: my doctos recommended using a snake venom to treat my radiculopathy.