The OneStep PCR Inhibitor Removal Kits are PCR inhibitor clean up kits that contain all the components needed for efficient removal of contaminants that can inhibit downstream enzymatic reactions (e.g. PCR and RT) from DNA and RNA preparations. The column matrices in these PCR inhibitor clean up kits have been specifically designed for the efficient removal of polyphenolic compounds, humic/fulvic acids, tannins, melanin, etc. from the most impure DNA and RNA preparations. With these PCR inhibitor clean up kits, sample clean-up is as simple as applying, spinning, and recovering a sample from the column.