diff --git a/build_projects/dotnet-cli-build/build.ps1 b/build_projects/dotnet-cli-build/build.ps1
index 73f5f5e9d..8094ed22c 100644
--- a/build_projects/dotnet-cli-build/build.ps1
+++ b/build_projects/dotnet-cli-build/build.ps1
@@ -10,6 +10,21 @@ param(
     [switch]$NoPackage,
     [switch]$Help)
 
+function RemoveDirectory([string] $path)
+{
+    if (Test-Path $path) 
+    {
+        Remove-Item $path -Recurse -Force
+    }
+}
+
+function CleanNuGet()
+{
+    RemoveDirectory($env:LocalAppData + "\NuGet\Cache")
+    RemoveDirectory($env:LocalAppData + "\NuGet\v3-cache")
+    RemoveDirectory($env:NUGET_PACKAGES)
+}
+
 if($Help)
 {
     Write-Host "Usage: .\build.ps1 [-Configuration <CONFIGURATION>] [-NoPackage] [-Help] [-Targets <TARGETS...>]"
@@ -63,6 +78,12 @@ if($LASTEXITCODE -ne 0) { throw "Failed to install stage0" }
 # Put the stage0 on the path
 $env:PATH = "$env:DOTNET_INSTALL_DIR;$env:PATH"
 
+# Ensure clean package folder and caches
+CleanNuGet
+
+# Disable first run since we want to control all package sources
+$env:DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1
+
 # Restore the build scripts
 Write-Host "Restoring Build Script projects..."
 pushd "$PSScriptRoot\.."
diff --git a/build_projects/dotnet-cli-build/build.sh b/build_projects/dotnet-cli-build/build.sh
index 2ec1a8a24..77fd912ca 100755
--- a/build_projects/dotnet-cli-build/build.sh
+++ b/build_projects/dotnet-cli-build/build.sh
@@ -101,6 +101,14 @@ then
     ulimit -n 1024
 fi
 
+# Clean old NuGet packages
+rm -rf "$HOME/.local/share/NuGet/Cache"
+rm -rf "$HOME/.local/share/NuGet/v3-cache"
+rm -rf "$NUGET_PACKAGES"
+
+# Disable first run since we want to control all package sources
+export DOTNET_SKIP_FIRST_TIME_EXPERIENCE=1
+
 # Restore the build scripts
 echo "Restoring Build Script projects..."
 (