Over Zealous TPG Grading As 'Cleaned'

Grading is subjective, so there's always some variability. You can resubmit, but it's generally only a good idea if you have a very valuable coin that you expect will gain more value than the cost of regrading.
That said, if they're calling half your coins cleaned, they likely are. Could you post pictures of a few?

Guess I'm learning that when the borders are significantly darker... this is an 'obvious' sign of cleaning? I do see that on a at least 1/3 of the above

indeed - They look pretty suspect and worthy of the "Details" grade. Id'e say learn "Shiny" - ain't MS!

Thanks GrapeCollects -- can I ask (to learn) what distinguishing marks helped you make that assessment?

I do now see the darker border on some-

Is there something to look for on the stars?

Im struggling to see a tell tale on 1) 1875-p 20c; 2) 1932-s 25c; 3) 1884-s Morgan --though the stars at 4-6oclock look funny; 4) 1875-s Trade; 5) 1932-D 25c, 6) 1860-s 50c

Thanks Numisma!!! Thats a huge help; really appreciate it

Agree they all look cleaned to some degree. The only one that might get a pass (without seeing the reverse) is the first Lafayette dollar. I agree with @Numisma that the main telltale sign is the lack of mint luster in the AU and uncirculated coins. You should try to examine as many problem-free, graded mint state coins as possible to get a feel for what original mint luster looks like. I would suggest you hold off on buying more raw coins until you get a good sense of cleaned vs original surfaces.

No problem (prepare for an essay).

Coin #1: 1875 20c

The coin, as NGC indicated, retains an XF amount of detail, however the coin appears to display very shiny surfaces, an attempt to imitate natural mint luster. The replicated "luster" is very matte and flat with, as indicated by above posters, no cartwheel to it. Also, an XF coin, generally speaking, will have little to no mint luster remaining, that should be a red flag on its own going forward. In addition, a collection of hairlines left by an abrasive cleaning can be seen in the right obverse field by the cap.

Coin #2: Lafayette Dollar

The cleaning in not as harsh as the previous coin, and generally has good eye appeal, however, from around K3 in the obverse field to K6 hairlines going N->S can be seen. While it is quite minor, it appears that whoever cleaned the coin may have been attempting to remove a stain or spot.

Coin #3: 1904-S Morgan

This coin, as designated by NGC, is high AU in terms of the remaining detail, however, as I previously described in the first coin, the luster is unnatural, shows no cartwheel, and is matte and flat. While generally some hairlines are present on AU quality coins as many Choice AU coins are "mishandled Uncs" the pattern of hairlines is much too consistent in their grouping and quantity to be natural.

Coin #4: 1932-S Washington quarter

Much similar to my speculation regarding the Lafayette Dollar, the cleaning on this coin was likely with the intent to remove spotting. The color on this coin is inconsistent and while residual mint luster is visible and present, largely the luster seems flat and unnatural, though to a significantly less degree than some of the previous coins. Also, while I cannot be sure without seeing the coin in hand, there appear to be hairlines from K2 to K4 heading W->E in the right obverse field.

Coin #5: 1886 Morgan dollar

See comments on Coin #3. I will say, the cleaning is SIGNIFIGANTLY, more minor on this coin. I'd also state I think that the coin may actually be an UNC Details coin rather than AU.

Coin #6: 1884 Morgan dollar

See Coin #3. I'd also add a scratched comment for the scratch running from the rim to hair by the 'U' of 'PLURIBUS'.

Coin #7: 1875-S Trade

Significant hairlines cover the obverse and what appears to be a large scratch are significant issues. In addition, significant staining borderlines environmental damage.

Coin #8: 1878 Trade

See coin #3 generally speaking. Surfaces are too bright for the grade.

Coin #9: 1875-S 20c

Harshly cleaned. Coin is extremely bright with matte and unnatural surfaces.

Coin #10: Lafayette Dollar

See coin #2. Generally the same, but to a significantly more severe degree.

Coin #11: 1932-S 25c

Coin is a technical XF with extensive hairlines and unnaturally bright and unnatural surfaces. Harshly cleaned with an abrasive.

Coin #12: 1884-S Morgan

See coin #3

Coin #13: 1860-S 50c

Harshly cleaned AU-50/3. Extensive hairlines are visible in the right obverse field that cross over the devices and into the left obverse fields.