5. Turn up the heat with a hot water carpet extractor.
Hot water extraction using properly mixed acid side cleaner ( an anti-browning treatment). Using a heated carpet extractor, this step will remove the solubilized oils and soils, neutralizing the detergents of the pre-spray which brightens the carpet fiber and prevents re-soiling. Make slow, overlapping wand strokes.
Inspect for spots that remain and reapply all-purpose spotter, agitate and allow dwell time. Directly extract any of these spot areas. Using a small detail tool with your carpet extractor will deeply and completely clean and dry these areas of additional saturation rather than additional cleaning strokes with the full wand.