Plug caps.
Quick fix, Wip them off and give them a good dose of WD40 top and bottom.
More Pernament fix, Dismantle the caps and check for internal corrosion which will be made worse by water ingress. Clean up any corrosion internally and seal the boots on the top of the caps with some silicone dielectric grease.
or
swap the caps for NGK straight ones which is what most owners do.
Quick fix, Wip them off and give them a good dose of WD40 top and bottom.
More Pernament fix, Dismantle the caps and check for internal corrosion which will be made worse by water ingress. Clean up any corrosion internally and seal the boots on the top of the caps with some silicone dielectric grease.
or
swap the caps for NGK straight ones which is what most owners do.