Apple devices can run hot, mobile devices run hot.
Ivy Bridge has a TJunction Max around 105C. This is embedded in the CPU for self preservation, it will throttle and then eventually shut down if throttling doesn't help. I do not know Apples thermal management presets used to control the fan profile, but the long and short is CPU gets hot > fans speed up > CPU cools off > fans slows down...maintaining a specific temp that balances fan noise, CPU temp and thus CPU performance.
I mention that because mechanical "fixes", accessories, etc can only effect the fan speed NOT the CPU temp. If for example you fan is running at its medium speed while you see 68C cleaning the fan will just cause Apples thermal management system (whatever its called) to say "I don't need as much fan to maintain 68C" and slow it down. However you are still at 68C. There are exceptions obviously, like the fan maxed out. If the fan is maxed it cleaning it, or replacing the thermal paste on the CPU could lower the CPU's temps. However this will be much higher than 68C.
Another consideration is ambient temps. Laws of thermodynamics dictate the rate heat energy will flow to colder objects/states (heat from CPU to heatsink to air) is largely effected but the differential in temperatures. AKA Hot rooms don't cool computers as well as cooler rooms.
60-68 degrees on pretty much any Mac can be completely normal. Some background task syncing while you feel you are otherwise doing nothing can get you into the 60's.
For example, I'm transcoding a 4k video on my 2018 13" i5 MBP, this is a spike before the fans settled in...
Core 2 spiked to 100C (TJMax).
The reason I mentioned all that is because without the aid of software you should just expect to see 60-68 with the task you are doing.
Cleaning the fans is a always a good idea. Possible replacing the thermal paste can help too. However don't expect desktop temps from a MacBook (or any laptop with a similar form factor). I've found some laptops aren't as aggressive as Apple with temps, and/or others are more aggressive with fan profiles as well. Typically though the heat sink becomes over saturated anyway due to its size.
If you are worried about your MacBook Pro...well I wouldn't be I would transcode video on my iMac (big laptop with desktop CPU) for 8 hours a day 7 days a week constantly in the 90 degree range for 4-5 years. Still runs like a top, and I even cleaned and the reapplied thermal paste (Kryonaut) to find it wasn't hardened pretty much at all.
