If you have access to a compressor, try using it to blow all the cr@p out from underneath. HAS to be easier than removing seats! Works real well on carpets too - then vacuum. A word of warning - don't take a shower until AFTER you do this.

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Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)