Any motorhome, no matter how old, or how expensive, is a sizeable investment. It stands to reason therefore that it is something to take good care of.
In short, there are just two levels of care really. One is items that you the owner can complete with relative ease, and the second is those that have to be done by appropriately qualified people.
One of the simpler items to attend to is a regular clean. Quite easy to accomplish, but a thorough clean inside and out can take some time to achieve. Depending on how you travel a full clean could be done on something like an annual basis. A bonus of a top to tail clean is that an inspection can be undertaken at the same time and anything requiring a repair can be noted for further attention.
Starting inside, it’s not a bad idea to turn out every cupboard and just check over everything to make sure you are not carrying any supernumerary travellers (living or dead!) and excess weight. Just from a health point of view, that is particularly necessary for past-their-use-by-date food items. Anything not used in the past 12 months say, would be a candidate for removing.
Once that has been done, then it’s time for a general vacuum and internal wash down/wipe over. Including in this could be any curtains or other upholstery that can easily be cleaned.
Certainly, the bathroom deserves special attention in the wash down as does the inside of items like the fridge and microwave oven.
Cleaning out the internal storage areas allows for an easy water leak inspection. Water leaks often start in the places that are hardest to see and the earlier they are found, the less long term damage is caused. A torch is often handy for this and checking for leaks is something done easily both visually and by having a good sniff in dark places. It's not only water leaks that can cause problems either - condensation and high humidity will often cause mildew and mould, where it's least wanted
Apart from emptying all the cupboards, especially if your motorhome has not been used for a while, check that all doors and windows open and close properly, and that all devices like the cooktop, fridge and hot water heater function work well. Frequently, there's not much maintenance to be done on most devices, but items like the hot water heater can benefit with the occasional flush and a regular (annual) check on the sacrificial anode.
Outside your motorhome, there are plenty of items that deserve your attention. It's always a good idea to have a slow walk around to make sure everything is where it should be. That can easily be done during a thorough wash. Don't forget the roof – that requires a good steady ladder and the underbody areas for which a mechanic’s creeper is excellent.
When washing a motorhome down, it is good to use a separate brush for all the windows. Acrylic windows in particular scratch easily and so a soft brush that contains as few dirt particles as possible is a smart move.
Tyres are sometimes items that get thought about when it's too late, usually when a tyre expires in a hurry. Unfortunately, tyres often degrade just as quickly whether being used or not. Regular daily/weekly air pressure checks are essential of course but visual checks are necessary too.
Depending on how sophisticated your electrical system is there are a few simple checks that can be done. For instance, 12V/24V batteries are mostly sealed these days, but that does not mean they should not be kept clean (to avoid unwanted discharging) nor all loose connections tightened up. Solar panels also don't require much attention, but a simple wash will keep them performing at top efficiency.
The above list is not exhaustive nor does it have to be done at any particular time! The point being that a few simple steps may well ensure many years of happy and trouble free motorhoming.