Assuming that the growth to 36GB was an unusual activity or was caused when it was in FULL Recovery Model and TLog backups weren't being run, then yes, a one off shrink is probably prudent.

In SIMPLE, the log still needs to be big enough to hold the largest set of concurrent transactions that occur during normal operations, so if there are no large batch jobs or large, long running transactions in general, you're unlikely to need a 36GB log. I would suggest reducing to 1GB for example, monitor for a week and see if it has grown at all (make sure you have enough free space for it to grow if needed) to see if you've found an appropriate level.

On some Data Warehouses I still require >50GB logs in SIMPLE mode, so it's very much dependent on the application profile.