Experiment was conducted in the laboratory of the Department of Entomology at Patuakhali Science and Technology University, Dumki, Patuakhali during January to March 2013 to evaluate the effectiveness of three detergents for suppressing whitefly in Sharupkhati variety of guava. Results revealed that Trix applied @ 7.5 g/l of water was found to be the most effective detergent in reducing the populations of 1^st, 2^nd, 3^rd and 4th instars and adult stage of guava whitefly after 48, 72 and 96 hours after treatment. Jet powder @ 7.5 g/l of water was found moderately effective for the reduction of immature and adult stages of guava whitefly at different hours after treatments. The efficacy of detergents in decreasing order was Trix>Jet>Wheel powder.