Agree. Medyo kakatakot mag pa engine wash. Best tip is make sure alam nila ginagawa nila. Based on experience they usually cover the computerbox,alternator. Tas they use spray never stream when washing any part of the engine. imageuploadedbytsikot-forums1436440765.365258.jpg
Heres a sample one done by qzone, thats where i have mine done on an annual basis.