If pesticides are present on the surfaces of your fruits and vegetables, you can definitely remove a substantial amount through washing and light scrubbing. However, you cannot remove all of them nor can you remove pesticides that have been incorporated into the fruits and vegetables while they were growing.
Yearly, Environmental Working Group (EWG) will come up with a list of Dirty Dozen fruits and vegetables (https://www.ewg.org/foodnews/dirty_dozen_list.php). If you're thinking of purchasing some organic fruits and vegetables, maybe you can focus on the dirty dozen as they contain the highest percentage of pesticides.