Too many Shauns & Boltons on this thread.
Derek,
I was not correcting you, sir, clarifying.
Shaun-p,
Sorry, it was Shaun_A that was talking of micro- splitters and my response Re. extra passes was addressed to users of these products. With a detergent pre-spray it may sometimes be necessary to re-apply the pre-spray if several non-detergent rinse passes fail to remove all the soil.
(Hope thas not further confused)