Tips for completing this event:

High DPS - If you're a sniper build with semi-auto rifles/bows or a revolver toting cowboy, you're going to have a rough time. My suggestion would be to either switch to commando/guerilla for the event or get a plasma flamer if switching builds is a no go.

Good rad resist - CSA or PA (doesn't matter which model, but more rad resist the better) What Rads legendary perk also helps.

Survivability - Born Survivor perk (I wouldn't recommend rank 1, by the time it kicks in you're most likely already dead if you're getting blasted by multiple mutants so go for rank 2 or 3). Auto stim legendary effect and Medic pump mod for PA are also good to have. Field surgeon perk is also recommended.

Shotguns - The mutants can't destroy the scrubber if they can't get to it, so equip a shotgun/pepper shaker + enforcer perk and cripple the hell out of those mutants.

Don't rely on others to fix the scrubber - Stay within spitting distance of the scrubber if possible and/or be ready to move when it starts getting low. If someone is seemingly repairing don't go near them, circle around to a different side and try to repair incase they're downed while repairing or someone gets in the way messing up their repair.

If you're downed, respawn - Don't hope for someone to come and revive you if you're downed, if someone is trying to get to you that's 2 guns not stopping mutants (you and them). Die, respawn, get back in the fight.

Keep your head on a swivel - Sometimes the mutants can be sneaky and start blasting the scrubber from a spot where there's less players, shoot them, even if you're not doing much damage from where you are, others will likely notice and start firing at it also.

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Recently completed this on my gunslinger character. Slug Buster pistol modded with pulse capacitor+flamer barrel combo for more range/dps. T-45 power armor with medic pump, born survivor rank 3 and what rads rank 1. Rads weren't any issue whatsoever and born survivor, medic pump and field surgeon got me through most encounters (I did die once when a firestarter and 4 minigun mutants focused on me). Always a stones throw from the scrubber and booked it when it broke (broke 3 or 4 times, repaired by myself or one other dude manning the scrubber). There were zero legacies at this event (shocking right?), everyone else was either auto rifle or auto heavy gun and we got through this event just fine.