help me erase textures,How do I erase textures in the texture drawing mode?

help me random noob here i need help erasing textures like trees and grass im holding control and dragging while holding down the left mouse button but im just drawing more help me im new to unity,hello, random noob here, Im seeing in videos on youtube where people say to press control and drag the mouse to erase textures like trees and stuff, but when i hold control and drag my mouse nothing happens please help im new to unity and dont know what im doing lol