Digital BW, The Print

I'm going to be changing from one brand of inks to another, and I 
was wondering if anyone can tell me whether there are 
differences among the various types of cleaning carts, or 
whether one's just as good as another.

I see that ink4art has a set of both BW and color cleaning carts 
for the Epson 1160 for $18 (http://www.ink4art.com/icon/
index.asp?method=cj&cc_p_CID=955968842&p_c_Name=
Printer+Cleaning), while Inkjetmall's cleaning carts are $49.50 
for both (http://www.inkjetmall.com/store/
darngoodcleaners.html).

ink4art says their cleaning carts are filled with glycerine and 
distilled water, but Inkjetmall doesn't clue us in to what their 
carts are filled with, other than the fact that they use some 
coloring.

Any recommendations?

Thanks,
Peter