At least im guessing its vision, any other additives it could be? Went to a custies this morning, (big house decent paying job but never pay online and always have to chase for brass) Anyway there fussy, have you done this bit that bit etc (too much brass) Missus comes out as i pull up, can you wait 2 mins my husbands on his way home he wants to speak to you, ok....anyway he gets there says weve had a free clean from this company (massive company) and they used an additive in the water and we think its done a better job, windows look shinier etc. I told them its something ive heard of but debated whether its any good or not. Custie insisted it was a better shine especially on the conny where it gets a lot of light. He said there perfectly clean when youve been they just dont have this shine. Anyway he asked if i could do the same, i said to be honest no its not worth me buying and experimenting for one custie besides ive none on me now anyway. He said can you leave it and i will let you know what the wife wants to do later. I said (after advice on here about taking no shite) no thanks ill leave it to the other company. Now, im a bit gutted as it was one of my best priced jobs however i never liked doing them as they were fussy so meh.. I was a bit annoyed theyd been trying another company out in the first place, i get the feeling theyre just fussy people with too much money and didnt really appreciate getting turned away, why they couldnt have rang me to let me know ive no idea. BUT got me thinking about using an additive, vision or whatever, would you guys consider using something in the same situation? or should i just forget about it and carry on with just pure?