Reddit reviews 8MILELAKE 2PC Plastic Razor Scrapers Knife with Contoured Grip with 100 pcs 16 mm Refillable Double Edge Plastic Razor Blades Ideal for Auto Window Tint Vinyl Tool Application

My arsenal of approved non marring tools I use.

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https://ads.midwayusa.com/product/602417/hoppes-brass-cleaning-picks-and-brush-set

https://www.harborfreight.com/automotive-motorcycle/trim-moulding/trim-and-molding-tool-set-5-pc-64126.html

https://www.homedepot.com/p/HDX-Nylon-Mini-Brushes-3-Pack-NMB3-HDX/206453096

https://www.harborfreight.com/4-piece-nonmarring-scraper-set-95832.html

https://www.amazon.com/8MILELAKE-Scrapers-Contoured-Refillable-Application/dp/B07F5KGLNX

https://www.amazon.com/1%C2%BD-yard-Abrasive-Cloth-Rolls/dp/B00JAOK90S (600 grit never use this with force it's only a deburring last resort long strokes )

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And whatever cleaning solution like brake clean, mineral spirits, acetone etc. whatever works best WD40 even. .

That's pretty much my entire arsenal of things I have to keep on hand to clean surfaces properly.

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Now this method isn't for your everyday mechanic trying to make money because it's very time consuming and if I were working on OEM applications I wouldn't be too worried about some of the unapproved methods described here because time is money and if you use the wrong method but you pay very close attention to how you work the ROLOC disc keeping the movement in large swings, using extremely light pressure low RPM you can achieve long lasting leak free finish for the rest of the life of the cars engine . It depends on a lot of factors like the stock studs combined with gasket type, torque pattern, checking head and block being square and true. Cleaning the mating surfaces by hand is extremely labor intensive in some situations it's easy to get frustrated and get whatever abrasive is handy.

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This thread is a good one because it's one of the most annoying and tedious tasks when rebuilding race engines. My engine has many places RTV is used and it get's old. Only enjoyable part is seeing a shiny clean factory looking finished part.