Does anyone know of a good way to clean save games of errors?

To be more specific, I have carelessly edited an item's constant effect enchantment from a mod I made, without ever unequipping it, and it appears to me that the old enchantment is permanently stuck on my charachter. I have looked around in the save using the enchanted editor, but didn't find anything that resembled a list of active effects (although I did see a larnge number of cryptic things that might have been it). Removing the mod completely is also of no avail.

So you modified an esp and now the savegame can't reconcile the new version with the constant effect left over from the old one.

What if you revert to an unmodified copy of the esp and load the save? Does the constant effect go away when you un-equip the item then?

I've always found http://wryemusings.com/#WryeMash to be an excellent tool, both for cleaning saves, and for preventing savegame corruption in the first place.

No guarantee, but this is what I'd try:
open the mod in TESCS,
look for the item,
look for the enchanting effect in the enchanting tab ,
take note of the enchanting id and the effect (imagine it is for instance sanguine horny fist_en, with fortify skill effect)
go http://www.uesp.net/wiki/Tes3Mod:RemoveEffects and take note of the numeric EffectID (for instance for sanguine horny fist_en with fortify skill, 83)

open a saved game with the mod loaded, unequip everything
go in 3d view mode,
open the game console,
click the player (you should see PlayerSaveGame in the game console header, meaning player is current selected object target of next console command)
type in the console:
removespelleffects ID
(for instance removespelleffects sanguine horny fist_en)
this should remove the spell
save game as test

remove mod from loaded mod list,
load saved game test
go in 3d view mode,
open the game console,
click the player
type in the console:
removeeffects EffectNumber
(in our example removeeffects 83)
this should remove the spell effect
if so ,save