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Stains on 2017 ceiling interior - possible roof leak?

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by aang86, Jul 30, 2022.

  1. aang86

    aang86 Junior Member

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    Hi all - I got a used 2017 Prius Two last year and it's been great, except today... I noticed these rather large brown stains above the rear doors on the ceiling, plus a few tiny rust-colored spots nearby.

    My first thought was water damage. It's a little odd, because I'm in Southern California and it's summer - so it hasn't rained in months. The car DOES get condensation on it overnight. I don't drive every day, so at most, this could have been happening over the course of a week before I saw it.

    Could it be the seal that runs along the roof?? The car does sit outside in the sun all day because I don't have a garage. Just wondering if this has happened to anyone else and if so, what you did about it? I had a 2007 before this, and nothing like that ever happened with that car. Any thoughts appreciated!!

    68089894574__EEF60266-109D-452F-899C-776D23704427.jpeg 68089893188__130A16DA-6816-495B-872F-4D4F2C1B13C1.jpeg
     
    #1 aang86, Jul 30, 2022
  2. CooCooCaChoo

    CooCooCaChoo Senior Member

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    Or it could be leaking from the shark fin antenna.
     
    #2 CooCooCaChoo, Jul 31, 2022
  3. Elektroingenieur

    Elektroingenieur Senior Member

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    The locations are consistent with the condensation problem for which Toyota Canada issued a service bulletin, discussed in my 2018 posting TSB (Canada): Condensation Dripping from the Headliner.
     
    #3 Elektroingenieur, Jul 31, 2022
  4. aang86

    aang86 Junior Member

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    Oh that is super helpful to know! Thank you! I was just so puzzled because we haven't had any problems when it rained. I read your other post. Hoping maybe an autobody shop can help me with the repair...
     
    #4 aang86, Jul 31, 2022
  5. Hidyho

    Hidyho Senior Member

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    After you get that fixed and if regular cleaning stuff won't clean it, you might try a product called Iron Out, in a powder (mix with water) and a spray, but as always, test a small area first, possibly in an area that won't bother you if it creates its own problem. Here is the spray:
    https://www.walmart.com/ip/Iron-OUT-Rust-Stain-Remover-Spray-Gel-24-oz/28802346?wmlspartner=wlpa&selectedSellerId=0&wl13=458&adid=2222222227728802346_117755028669_12420145346&wmlspartner=wmtlabs&wl0=&wl1=g&wl2=c&wl3=501107745824&wl4=pla-293946777986&wl5=9028163&wl6=&wl7=&wl8=&wl9=pla&wl10=8175035&wl11=local&wl12=28802346&wl13=458&veh=sem_LIA&gclid=Cj0KCQjw852XBhC6ARIsAJsFPN3BGfzVjhPWwZWNFswQ8NK9OBsWS2qcPB5iPEiKJRXZ-vMwqyhnt_YaApniEALw_wcB&gclsrc=aw.ds
     

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    #5 Hidyho, Aug 1, 2022
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  6. CooCooCaChoo

    CooCooCaChoo Senior Member

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    Actually cleaning it is gonna be a pain in the nice person. Another forum user scrubbed the headliner trying to clean a stain and it came apart.
     
    #6 CooCooCaChoo, Aug 1, 2022
  7. aang86

    aang86 Junior Member

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    Yikes. Yeah, I'm not looking forward to cleaning it.

    A small update: I haven't gotten the car to an autobody shop yet, but I've noticed some faint staining on the rear passenger seats, too. Wth. I'm totally flummoxed as to how a little condensation could be causing this much of a problem.
     
    #7 aang86, Aug 5, 2022
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