Ralph,..gutters are gutters and siding is siding,..all part of a house wash yes,...,..But although they are both part of a house wash,..siding material and the overall square footage makes it totally different than scrubbing narrow painted gutters where you aren't gonna make a mess of them,..like what can happen once you begin to remove oxidation from vinyl siding.
When you have a while side of a two story house to remove oxidation from and make it even,..that is ALOT of work and still may not end up exactly proper. The larger the area the more likely it is to see uneven-ness in the siding,. totally different with,..something like gutters that are narrow and easy to make look right.
Oxidation on gutters is removed by default more than on purpose,..meaning,.the nature of removing gutter streaks and the product(s) used will remove oxidized paint as well. Gutters in many cases can not be cleaned the way siding can,..so even cleaning gutter is a different scenario,.but still part of a house wash and should be evaluated by the contractor and added to the total cost,.but not separately,..When I see people charging separately I feel like they would rather not do them,..even at the cost of a crappy looking job,..simply because the homeowner didn't want to pay "extra",..even though the customer would pay the price had it not even been mentioned.
Breaking out a scrub brush isn't an add on,.it's part of the job,..just like lifting window screens and properly cleaning the inside of the sill, and brushing over the windows,...which I know many don't do.
Do we start charging if we have to use a ladder? Maybe some do I guess.
As I said,.customers in this service want a professional to evaluate their home and give them a cost to make it look nice,..they don't want to hear,.."It's this much for this and this much for that where the main body of the house is concerned"
Jeff