Do the following as SOON as possible. Don't even wait another hour or two.. water is soaking things and mildew/mold is getting started.

1. Get a shop vac and vacuum any wet spots once or twice, to pull all water out possible. Carpet should be damp now.

In order of preference (best to worst)
2a. Put a humidifier in the car, crank it, and shut the windows as much as possible. Extension cord should go through the door seal. Let it suck the water out of the air in the car. Check every so often, to make sure it isn't full of water.

2b. Fan in the car with one window cracked a little bit (enough for the extension cord)

2c. Small space heater in the car. The reason this is ranked lower in preference than 2b is because this has the highest risk of fire.. 2a and 2b are pretty much completely safe.

3. Once dry have the car vacuumed/cleaned/run an ozonator if necessary. The really scary stuff (mold) will be fixed by the end of step #2 so this is more to get rid of smells and for cosmetic reasons.

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'83 300SD 335,000km (207k) mi SOLD
'87 560SL 163,000km (101k mi) SOLD
'86 300SDL 356,000km (220k mi) SOLD
'92 500SEL 250,000km (155k mi) SOLD
'90 300SL 140,000km (87k mi) SOLD
'01 S430 260,000km (161k mi) SOLD
'03 SL500 167,000km (104k mi) SOLD
'07 S550 4MATIC 235,000km (146k mi) SOLD
'07 GL320 CDI 4MATIC 348,000km (215k mi)
'13 GL350 BlueTec 4MATIC 170,000km (105k mi)
'14 SL550 72,000km (43k mi)