harvesting yeast - how crucial is sanitizing?

[Dontdropthebeer]

After a few beers last night I decided to try to harvest some yeast from Allagash House Beer bottles. I boiled a mason jar in water for a bit and let it cool down. Then I had 3 of the house beers and poured them into a glass and left the last inch or so, and took the 3 bottles and poured them into the mason jar. I then covered it with tinfoil and put it into the fridge. Today I was going to make up a little low gravity wort and add it but I remembered I neglected to spray any star san in the jar, the foil, the rim of the bottle, etc.

I was going to use it to try to recreate the house beer but now Im wondering if I should start over with a new and sanitized yeast harvest.

Thoughts?

 

[flars]

Go ahead with your plan to make a 1.010 starter wort. If the jar contained something infectious you'll know in about four weeks.

 

[Dontdropthebeer]

What will I be looking for?


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[flars]

If an infection is present an oily or white fuzzy film will start growing across the surface of the wort.
There is a post your infection thread somewhere on the site.
The yeast may also turn from white to grey.