More than enough, mine stays clear with just 1 bag. I originally bought mine after a bottle of lime cordial (Christmas snowballs) disgorged its contents in the boot. A lot of mopping up plus I also sprayed ACF-50 all around the HV battery compartment.
A pipe clip as well, very pro! Looks like a neat job even down to the PTFE tape. No need to turn off the water to re-align it, slacken the compression nut slightly with a cloth underneath, re-align and tighten 🙂
£540 for a wheel bearing?? Are you sure that's not for all 4?
Have a look at this:
https://www.ebay.co.uk/itm/Lexus-IS200T-IS300H-Hybrid-2015-Front-Wheel-Hub-Bearing-Fast-Dispatch-/202967180472?_trksid=p2349624.m46890.l49292
You could have it fitted by any decent car mechanic who has the right equipment, I wouldn't anticipate paying more than 2 hours labour charge.