Originally Posted by Deedsie
Which parts of the bike would be the most vulnerable? Was thinking of doing the wheels separately. Then wrapping the chain etc before washing the frame?
Basically any part that has bearings/grease or has pivot-points/bushes/lubrication.
This means that you should also exclude the headset, bottom bracket, pedals, brake calliper pivots, brake/gear cable ends, derailleur pivot-points and brake levers/gear shifters.
What that means is that there are so few safe areas that you could safely spray with a jet washer, that you should avoid using one and instead wet the dirt with a hose (standard domestic tap-pressure) or a Muc-off trigger spray or similar, and then agitate the heavier dirt with a dishwashing brush or similar, and then rinse with the same low-pressure hose. You can then bump the excess water off the bike and lubricate all the areas/points mentioned above with light spray oil and do the chain with your favourite wet or dry lube, depending on the current weather conditions. Taking the wheels off will help reach tricky areas, You can also remove the right crank/chainwheel if required.