[header] How to fluff up carpet [title] Spray the affected carpet areas with vinegar and water. [step] Mix equal parts of water and vinegar in a spray bottle. Thoroughly spray the dented or flattened area of carpet. 
Make sure to cover the whole area with liquid, but don't saturate the carpet so that it's soaking wet. [substeps] Make sure the spray bottle is clean and free of other cleaners or chemicals before you use it.