relentlessscrubbing

noun
UK /rɪˈlɛntləs ˈskrʌbɪŋ/
US /rɪˈlɛntləs ˈskrʌbɪŋ/

Scrubbing something very hard and never stopping.

The relentless scrubbing finally made the old pot shine.


OTHER MEANINGS

2. A determined effort to clean something completely.

Her relentless scrubbing got every spot off the floor.

3. Repeated hard rubbing that does not let up.

The relentless scrubbing wore down the sponge.

4. A way of cleaning that keeps going until the job is done.

With relentless scrubbing, the muddy boots looked new again.