Washing underside of motorhome (1 Viewer)

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Jul 25, 2022
312
360
Newington, Sittingbourne, Kent, UK
Funster No
90,146
MH
Burstner
Exp
July 2022
As a relatively newbie (first MH purchased last August) and still learning, what are Funsters thoughts on getting underneath the MH with a power washer with the pressure dialled down to remove any winter salt residue? In my car I don't think twice about running it through my local IMO and selecting the under car wash, but I'm conscious of water penetration. Is it best to stop worrying and leave it? After all, won't a few runs out in wet weather end up washing all the salt off anyway?
 

PP Bear

LIFE MEMBER
Apr 5, 2013
7,968
29,784
Kent, UK
Funster No
25,395
MH
Auto Trail Dakota SE
Exp
2012
Having been under my coach build and looked at the shoddy, rubbish wiring that the Autotrail fitters left, the poor insulation and exposed connections, I’d steer well clear of any forced attempt of cleaning there.

Once you’ve had any form of electrical failure on a van and the nightmare it sometimes is to locate the fault, you’d definitely not think about it.
 
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Feb 16, 2020
2,443
3,352
KT15.
Funster No
68,772
MH
Sunlight. T66. 2019.
Exp
Absolute beginners.
Hmmee, a pertinent question. I was under our bus yesterday fitting a home brewed spare cassette carrier. Whilst under there I also took the bungs out of the waste tank to give a good squirt round inside with the hose pipe. I noticed that on the light weight carrier cradle for the grey water tank the dusting of paint was already starting to peel off. It was crossing my mind whether to give the underside a good squirt over as well. Perhaps just a well targeted washing rather than a broad sweep? To repaint the the waste tank carrier would be a PIA, whether in situ, or removing from the vehicle all together, do others bother doing anything or just chalk it up to the ageing process?
Any ideas on the best re-coat material for the underside of the floor sandwich, and the floor to wall junction, I'm thinking some water based bitumastic, " Black jack " or " Thomsons 10 year " flexible flat roof sealant?
Mike.
 
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Feb 25, 2020
247
490
Funster No
69,004
MH
PPVC Autocruise Alto
Exp
I'm a newbie
For me and my PPVC I always give it a powered wash underneath pre it’s March MOT just to make it easier for the MOT inspection and they also let me have a good look around it whilst up on the ramps, I then disconnect and reconnect things like the electric steps, tank level sender units etc to make sure that connections are still good and not corroded etc

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Kannon Fodda

LIFE MEMBER
Feb 26, 2019
2,714
8,397
Seek and Ye May Find
Funster No
58,768
MH
Autotrail V-line 540
Exp
I Make Schoolboy Errors!
Never bothered to try and wash under the car, maybe a bit of a hose around the wheel arches, but that is about it. And if you use one of the many handwash places where hoards of people jump on it for five seconds the washers go nowhere near underneath.

But jetwash under my PVC would be asking for issues. There are intentional openings in the floor of the PVC towards the rear to allow for ventilation into the Trauma heater locker for a fresh air supply to the heating ductwork. Some of the pipe apertures are barely sealed with mastic, and who knows about the stuff that can't be seen above tanks. Not sure that the alarm sounders would welcome water sprayed into them (they do face opposite from the van driving direction).
 
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Feb 25, 2020
247
490
Funster No
69,004
MH
PPVC Autocruise Alto
Exp
I'm a newbie
Rust what’s rust ? Chassis rails all injected with wax oil, floor pan 99% covered with wax oil, I dropped the tanks to make stronger hangers and wax oiled the floor above the tanks, re mastic where it was suspect, Anyway a medium underneath pressure washer once in the spring is nothing to a years driving of road water, salt, grit and muck.

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