Here are some befor and after pics. admitidly they are not that bad to start with but the carbon on the exhaust valves was rock hard and would not budge with any other method of cleaning.
before cleaning:-
IMG_20171101_171640.jpg
IMG_20171101_172103.jpgIMG_20171101_172058_HDR.jpgIMG_20171101_172053_HDR.jpgIMG_20171101_172046.jpgIMG_20171101_172040_HDR.jpgIMG_20171101_172034.jpgIMG_20171101_171958.jpgIMG_20171101_171951.jpgIMG_20171101_171949.jpgIMG_20171101_171940.jpgIMG_20171101_171932.jpgIMG_20171101_171926.jpgIMG_20171101_171922.jpgIMG_20171101_171919.jpgIMG_20171101_171912.jpgIMG_20171101_171907.jpgIMG_20171101_171902.jpgIMG_20171101_171856.jpgIMG_20171101_171852.jpgIMG_20171101_171851.jpgIMG_20171101_171848.jpgIMG_20171101_171843.jpgIMG_20171101_171730.jpgIMG_20171101_171729.jpgIMG_20171101_171726.jpgIMG_20171101_171725.jpgIMG_20171101_171722.jpgIMG_20171101_171718.jpgIMG_20171101_171712_HDR.jpgIMG_20171101_171706_HDR.jpgIMG_20171101_171658.jpgIMG_20171101_171651.jpg
after cleaning:
-IMG_20171101_175004.jpgIMG_20171101_174914.jpgIMG_20171101_174910.jpgIMG_20171101_174857.jpgIMG_20171101_174917.jpgIMG_20171101_174920.jpgIMG_20171101_174924.jpgIMG_20171101_175000.jpgIMG_20171101_174956.jpgIMG_20171101_174950.jpgIMG_20171101_174946.jpgIMG_20171101_174941.jpgIMG_20171101_174940.jpgIMG_20171101_174938.jpgIMG_20171101_174933.jpgIMG_20171101_174929.jpgIMG_20171101_174928.jpg