Weird foam coming from crack in garage floor

[Kipernicus]

Noticed this dried up foamy stuff under the car, like it dripped off and crystallized. Not salt (bay area).

Maybe residual car wash soap? I go to Foster City touchless, but it has been weeks since I last went. Or something else I picked up from the road?

 

[Kalud]

Looks like fungus to me, probably not from the car itself but more from the garage floor + water / humidity from the car...

 

[Hybris]

cocaine?

 

[EdA]

Road salt...you should see my garage.

 

[AMPd]

cocaine?

Now that's what I call a car paying for itself!

 

[tezco]

Looks like concrete efflorescence.

 

[TurboFroggy]

cocaine?

Yeah that and stripper glitter keep building up in on the back seat of my P85.

 

[SFOTurtle]

Road salt...you should see my garage.

Road salt in the SF Bay Area?

 

[jdevo2004]

It is AL2O3. A few more years and you wont have much of a car left!

 

[Kipernicus]

It's interesting that it doesn't happen under my wife's car (acura tsx). For some reason the water dripping off the MS is causing efflorescence but water off the Acura does not? Anyone else seeing this?

 

[jdevo2004]

I just said it, your car is rusting from the inside out. Aluminum Oxide.

 

[Joe H.]

Interesting, this is currently being discussed in another thread: My baby got hurt - Page 2

 

[artsci]

Looks like something you could get high on

 

[tezco]

Perhaps salt was previously deposited in only that parking space.

 

[Joe H.]

I was trying to link to another thread where a similar "white powder" has shown up (much smaller amounts) in other peoples car and they are speculating corrosion as well. Look at page 2 of the "My baby got hurt " post under the main Model S forum. Now that is a lot of powder so let's just hope it is salt or cocaine.


My other post said it was waiting for mod approval and I guess it never got approved.

 

[lorih]

Kip, there is a lot of speculation here. Did you bring the car, and a sample of the white stuff to Tesla service to see what they think? That seems like the reasonable thing to do.

(Speaking of reasonable, if I didn't know how reasonable and well behaved your sons are, I would have said it is just laundry soap they put under your car to play a prank on you, but your kids are too well behaved for that.)

 

[Lloyd]

This is lime salts leaching from underneath your slab. It is due to excess moisture underneath your slab, and/or improper moisture barrier applied underneath it. It has nothing to do with your car! In the summertime see if you can improve the drainage away from your house to keep the soil drier.

 

[lorih]

That's the best suggestion I've seen here, and easy to test. Clean off the garage floor, switch parking spots with wife's car, and see if it comes back.

 

[Zextraterrestrial]

That's the best suggestion I've seen here, and easy to test. Clean off the garage floor, switch parking spots with wife's car, and see if it comes back.

or put a bit of acid on it and see if it bubbles.

or not since aluminum oxide will react w/ both acid and base...bad test

 

[lorih]

Chemistry...cool!