I have a vienna lager fermented with Wyeast 2124 bohemian lager about 2 weeks into lagering. I did a d-rest but my hydro was off by 5 points and I think it was too late--lots of diacetyl. I'm going to try and fix it by krausening in some fermenting wort and was hoping for some feedback.
What sort of volume will I need to krausen into a 5 gallon batch to clean it up? So I'm thinking a 1-2L starter of either kolsch or bohemian pilsner and pull it out of lager to 62F for a few days. Alternatively I think my next batch might be a mild so I can pitch some of that in, probably also with the kolsch. Other concerns or methods of fixing it? Thanks.