Actually, that’s what I tell people to do, while they are doing cleansing baths and the like, it’s really more geared at removing hex’s/curses/unwanted entities and the like than it is at grounding.
Grounding can be done by picturing roots sprouting from feet, going deep into the earth, and the bad energy flowing out while your roots take in new good energy that the earth has cleansed, or taking it in through the crown from the sun or another source.
But like Dk mentions, grounding is often done with physical activity, particularly when you know you are at risk for getting swept away into the abyss. I like mindless phone games, tap tap-keeping me here with each tap/movement.