Hi David,
Chemspec HDSL is one of my favourite products.
However, if you find your micro-splitter needs an additional boost on greasy areas, try a very light misting of Eco Spotter before the M-S ( Solution No. 4 or One-Step Fineline being more suitable where natural fibres are involved). One agitation will do for both products.
By adhering to micro-splitters you avoid the situation where some of the micro-splitting action is taken up by breaking down the other product, which it will treat in the same way as any other contaminant, such as the soil.
I am sure that both Nick and Steve would confirm this.