This project was a continuation of previous tests that determined that Orvus WA Paste is an effective agent in soil removal on wool and cotton. The tests compared the soil removal capabilities of surfactants used in textile conservation. The purpose of the current study was to estimate the optimum concentration of Orvus WA Paste for soil removal on cotton. This was achieved by measuring the cleanliness and amount of redeposition of soiled test substrates when washed in different concentrations of the surfactant. These differences were measured with the aid of a spectrophotometer. Results indicated by the parameters of this test concluded that a 1% solution gives the optimal cleaning.