Toggles:
Shout only removes finish from painted surfaces. If you have a proper set of laundry appliances made back in the days when companies gave a damn about quality, you'll have porcelain and a bit of Shout isn't a problem. You still may need to be careful about control panels; the Maytag pair I had in Atlanta had pretty significant prewash damage to the Sungold paint on the control panels when I bought the machines. But the porcelain was still pretty much pristine.
I don't think this is still the case, but for a while, appliance parts stores used to sell control panel overlays for popular washer and dryer models, so that prewash damage to panels could be repaired. You removed the knobs, and pressed the self-stick overlay into place on the control panel (they were precut with the correct holes for your control shafts); then you put the knobs back in place. Voila! No more uglies, and you could read the control markings again.
As always, later DD Whirlys seemed to bear the brunt of prewash damage, because of their painted tops vs. the porcelain used on other makes.