To clean exhaust valves you need to use a more aggressive technique than ultrasound. In this video I use three non-abrasive scraping methods to remove the carbon layer from the valves. ⬇︎ ???????????? ⬇︎ It is very important not to use abrasives that could remove metal ???? from the surface of the valves. So I chose the following three types of scraping: Scotch Brite Eco: http://gbrnr.com/0rntSX Nylon Circular Brush: http://gbrnr.com/sSuyyZ Brass Circular Brushes: http://gbrnr.com/1m54XA I compare their effectiveness in this video, it's up to you to tell me which method is best ???? ????????????General tools???????????? Drill: http://gbrnr.com/1eH3aN Cutter: http://gbrnr.com/NO0BLi Combination wrenches from 6 to 32 mm: http://gbrnr.com/gtzR1i Workshop: Vice: http://gbrnr.com/7BfOnT Vice Jaw: http://gbrnr.com/gsg9eS ???? ????Pneumatic tools ???? ????: Pneumatic Tool Oil: http://gbrnr.com/l2FJnu Compressor: http://gbrnr.com/KgRDJJ Pneumatic Grinder: http://gbrnr.com/nQPaWg Products: WD-40: http://gbrnr.com/WD40WD Consumables: Paper Towels: http://gbrnr.com/Gcrozn Microfiber Cloths: http://gbrnr.com/nbTbxk Fuel Hose by the Meter: http://gbrnr.com/xd4UrD Personal Safety: Disposable Gloves: http://gbrnr.com/aHu8yJ Safety Glasses: http://gbrnr.com/RYtmjX Coveralls: http://gbrnr.com/3YTX5j Safety Shoes: http://gbrnr.com/1WU5np Ear Defenders: http://gbrnr.com/128Vjx ???? Links to the song GBRnR ???? ???? ???? ???????? iTunes: http://gbrnr.com/XaeXMz Apple Music: http://gbrnr.com/GlQjvx Deezer: http://gbrnr.com/dQCwH2 Amazon Music: http://gbrnr.com/AiHv6U Spotify: http://gbrnr.com/EBxqsS Follow GBRnR on: /gbrnr/francoisgbrnr and http://gbrnr.com/ Contact: http://gbrnr.com/contact ????DO NOT CLICK ON THIS LINK: http://gbrnr.com/bRV7DX ❌ ???? The links provided to the tools and products may be equivalent to those used in this video. These links are affiliate links to partner sites such as Amazon.fr or ManoMano.fr that allow the Garage, Bagnoles et Rock'n Roll channel to receive a commission. The videos on the Garage, Bagnoles et Rock'n Roll channel are published for entertainment purposes only. Their author cannot be prosecuted for any negative consequences resulting from the use by their viewers of all or part of the information they contain. Please always wear personal safety equipment when carrying out similar mechanical work. If in doubt about the danger of an operation, its consequences or your own ability to carry it out, call a professional.