Harold (Joe) Nephew said he bought a pressure washer, but only a scrub brush gets the black gunk out of the crevices in vinyl siding.

Source: https://www.adirondackexplorer.org/stories/a-new-adirondack-growth-whiskey-fungus

I had a more traditional spoon shaped rest that was difficult to clean, and there always was a pool of gunk from who knows where.

Source: https://www.buzzfeed.com/mariasabella/things-from-amazon-with-such-great-reviews-1-3-23

Mr Hungerford said his health battle began in December 2019 when he felt a pain in his right thigh – and, after some 'nasty-looking gunk' was removed from his leg, he was still in intense pain one month later.

Source: https://www.dailymail.co.uk/news/article-12246007/British-tech-boss-terminal-cancer-sets-charity-bereaved-children.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

Unchecked this develops into a ‘productive’ cough, with loads of thick, tenacious gunk being coughed up, which we refer to as ‘sputum’.

Source: https://www.pattayamail.com/pattayamail/modern-medicine-have-you-had-the-spring-cough-428631

Words are one thing, but just look at all of that gunk left over on her hands after massaging the cleansing oil onto her skin.

Source: https://stylecaster.com/beauty/skin-care/1641277/anua-cleansing-oil/