You could try something like an open ESD floor mat, cut down to size.  I'm not sure how long the natural rubber would hold up to your wash process or how much spray jet shadowing is tolerable. http://www.wearwell.com/Static-Control/Conductive-Mats/Modular-WorkSafe-Light-ESD.html 
 Mike> Date: Tue, 18 Dec 2012 15:33:01 +0000
> From: [log in to unmask]
> Subject: [TN] Source of ESD Mats Suitable for  in-line wash baskets
> To: [log in to unmask]
> 
> Does anyone have a source for soft polymer ESD grid mats (similar to screening but with ~ 1 inch openings) that would be suitable to go through an inline wash system?
> 
> The function of these mats would be to serve as a cushion to the bottom side SMT components as they get shifted by the wash jets. 
> 
> Finding them ESD safe (safer/safe-ish ) is the challenge. 
> 
> Thanks in advance. 
> 
> Rich  Kraszewski/PLEXUS
> 
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