Is there a recognized method to properly clean a coin, or is this just poor word choice by NGC? : r/coins

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Is there a recognized method to properly clean a coin, or is this just  poor word choice by NGC? : r/coins
Who can tell me what is special about this 1918 S Buffalo Nickel? Do you know? It makes a difference in value. - US, World, and Ancient Coins - NGC Coin Collectors Chat Boards
Is there a recognized method to properly clean a coin, or is this just  poor word choice by NGC? : r/coins
3 Ways to Get a Coin Graded - wikiHow
Is there a recognized method to properly clean a coin, or is this just  poor word choice by NGC? : r/coins
Should all coins be lightly cleaned : r/AncientCoins
Is there a recognized method to properly clean a coin, or is this just  poor word choice by NGC? : r/coins
Coin Conservation, NCS, Numismatic Conservation Services
Is there a recognized method to properly clean a coin, or is this just  poor word choice by NGC? : r/coins
Coin Conservation, NCS, Numismatic Conservation Services
Is there a recognized method to properly clean a coin, or is this just  poor word choice by NGC? : r/coins
Should all coins be lightly cleaned : r/AncientCoins
Is there a recognized method to properly clean a coin, or is this just  poor word choice by NGC? : r/coins
Jeff Garrett: Why Rare Coin Security Is So Important
Is there a recognized method to properly clean a coin, or is this just  poor word choice by NGC? : r/coins
Grading coins in lower-tier holders — Mint News Blog
Is there a recognized method to properly clean a coin, or is this just  poor word choice by NGC? : r/coins
RCMR - 2019 #4 July/August by Professional Coin Grading Service (PCGS) Market Report - Issuu
Is there a recognized method to properly clean a coin, or is this just  poor word choice by NGC? : r/coins
Coin Collecting
from per adult (price varies by group size)