Ofc., having Detectors and Detection in the first place should’ve been the case. However, it doesn’t always work that way. We get lost in BO (build orders)*, macro, micro, and “preventing/putting out fires”. For some COs, prestiges, and their masteries. So anything that has the “Detector” keyword when you click on a unit (e.g. Observer, using Stukov’s Queen’s Ocular Symbiote ability on a unit) or structure (e.g. Missile Turret or Cannon) is off limits.
Karax - Orbital Strike. If you can make out the distortion of cloaked units, just fire upon that. For burrowed units, you can see where Locusts spawn from SH, spines shoot out from Lurkers, and projectiles come from from WM (Widow Mines). For other things like Banalings or Spider Mines, you would need to waste some shots. FWIW, if you have the Phase Detonation upgrade, you’ll see the “swirly effects” when you do connect hits.
Solar Lance… this is overkill for stray units (since it’s meant for waves or base defenses), but it does offer more margins of error (esp. when taking out a nuking Ghost).
Purifier Beam… even more overkill. Only use this if they’re part of a base or wave.
Zeratul - Have Zeratul use his Cleave ability
Vorazun - Time Stop. It’d be overkill just for that, but I usually want to use it anyways.
Tychus - Shredder Grenade. It may take several shots, but works in a pinch.
Mengsk - ESO
Zagara - manually explode Banalings or Scourge where you suspect cloaked/burr units are. If you have Zagara herself, her Banaling Barrage!
Abathur - Ravagers. Bile Bomb the areas in question!
Stetmann - Have Gary E-Gorb the areas
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*. Had a game on L&L as Nova. We take on the left lock, I send Nova in, but we’re still not able to take on the SH and Lurkers. “The one time” I forgot to queue her Ghost Visor upgrade! My ally noticed and slapped a Chrono Boost on my Ghost Academy 8)