I use Clorox outdoor (do the tree sap separately, try turpentine, and there are products at your FLAPS to do that too. If your canvas is tucked in and the too is secured, you have nothing to worry about. 

Jim

On Nov 26, 2012, at 5:24 PM, JordanVw@AOL.COM wrote:

> In a message dated 11/26/2012 2:57:49 P.M. Eastern Standard Time,
> jon_durham@KNOLOGY.NET writes:
> 
> use  bleach to remove?
> 
> 
> 
> 
> not a good idea.   what if it leaks thru to your  canvas?   then you got
> zebra striped  canvas..