I've only used 'cleaners' and 'additives' for my older cars where I found they cleaned the injectors, etc and put the car back to what it should be like. Found they did jack-all for the newer cars.
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2014 [14] M135i, 3dr, MG, Auto, SP, CP, HS, HK and FBP
Recent Past.....
2011 [61] Abarth 500, Funk White, Leather, H&R
2007 [57] 320d M-Sport Touring
Pre 2007 - GT TDI 4MO, Mk4 R32, A3 TQ, A3T, Cupra R and on and on and on.....