texture and cleaning up

Dear Team

i am using a textures to brush :
m_brush~~>setPosition;
m_brush~~>visit();

wich work well , but i would like to erase all the painting and all method i am using doesnt work (texture.clean or texture.cleanup).
Any Idea how i could erase my texture and start again without having to re instance object ??

thanks you
david

the clear does work

thanks

david